I just don't understand what you could be representing here.. What could you raise so much on the flop with that you his runner runner clubs? What could you hit on the river that would make you push? a set of 5s? an inside straight? The ONLY hand he can put you on is 67 of diamonds, and that just seems quite unlikely. He's probably got a set of something, and like it has been said, I don't see how he can fold unless he's sure you would NEVER bluff the river... I don't mind calling as much as I do raising, there is just no hand that he can check call the flop with and lead the turn that you could have beaten.. and he can't call you with a worse hand, except MAYBE 99, and even then he'd have to have some sort of extreme read, and it sounds like he's much too tight to play that hand this way.